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多选题Which two statements regarding asymmetric key encryption are true？（）AThe same key is used for encryption and decryption.BIt is commonly used to create digital certificate signatures.CIt uses two keys： one for encryption and a different key for decrypti

题目
多选题
Which two statements regarding asymmetric key encryption are true？（）
A

The same key is used for encryption and decryption.

B

It is commonly used to create digital certificate signatures.

C

It uses two keys： one for encryption and a different key for decryption.

D

An attacker can decrypt data if the attacker captures the key used for encryption

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相似问题和答案

第1题：

Which encryption type is used to secure user data in an IPsec tunnel?()

A. symmetric key encryption

B. asymmetric key encryption

C. RSA

D. digital certificates


参考答案：A

第2题：

Symmetric, or private-key, encryption is based on a secret key that is shared by both communcating parties. The （ ） party uses the secret key as part of the mathematical operation to encrypt （ ） text to cipher text. The receiving party uses the same secret key to decrypt the cipher text to plain text. Asymmetric, or public-key, encryption uses two different keys for each user: one is a （ ） key known only to this one user; the other is a corresponding public key, which is accessible to anyone. The private and public keys are mathematically related by the encryption algorithm. One key ia used for encyption and the other for decryption, depending on the nature of the communication service being implemented. In addition, public key encryption technoligies allow digital （ ） to be placed on messages. A digital signature uses the sender&39;s private key to encrypt some portion of the message. When the message is received, the receiver uses the sender&39;s （ ） key tp decipher the digital signature to verify the sender&39;s identity.

A.host B.terminal C.sending D.receiving A.plain B.cipher C.public D.private A.plain B.cipher C.public D.private A.interpretation B.signatures C.encryption D.decryption A.plain B.cipher C.public D.private


正确答案：C,A,D,B,C

第3题：

Which two statements are true about encrypting RMAN backup?()

A. The transparent encryption of backups uses the encryption wallet

B. The database uses the same encryption key for every encrypted backup

C. The password encryption of backups only uses the password while creating and restoring backup

D. If transparent encryption is configured, you cannot use the SET ENCRYPTION BY PASSWORD command to make password-protected backups.


参考答案：A, C

第4题：

Which two statements best describe the wireless security standard that is defined by WPA (Choose two.)（）。

  • A、It specifies use of a static encryption key that must be changed frequently to enhance security
  • B、It requires use of an open authentication method
  • C、It specifies the use of dynamic encryption keys that change each time a client establishes a connection
  • D、It requires that all access points and wireless devices use the same encryption key
  • E、It includes authentication by PSK

正确答案:C,E

第5题：

Which statement is true about a certificate authority？（）

  • A、An entity responsible for registering the private key encryption used in a PKI
  • B、An agency responsible for granting and revoking public-private key pairs
  • C、A trusted third party responsible for signing the public keys of entities in a PKIbased system
  • D、A trusted third party responsible for signing the private keys of entities in a PKIbased system

正确答案:C

第6题：

Which statement is true regarding a session key in the Diffie－Hellman key－exchange process?()

A. A session key value is exchanged across the network.

B. A session key never passes across the network.

C. A session key is used as the key for asymmetric data encryption.

D. A session key is used as the key for symmetric data encryption.


参考答案：B

第7题：

Symmetric, or private-key, encryption is based on a secret key that is shared by both communcating parties. The （ ） party uses the secret key as part of the mathematical operation to encrypt （ ） text to cipher text. The receiving party uses the same secret key to decrypt the cipher text to plain text. Asymmetric, or public-key, encryption uses two different keys for each user: one is a （ ） key known only to this one user; the other is a corresponding public key, which is accessible to anyone. The private and public keys are mathematically related by the encryption algorithm. One key ia used for encyption and the other for decryption, depending on the nature of the communication service being implemented. In addition, public key encryption technoligies allow digital （_______） to be placed on messages. A digital signature uses the sender's private key to encrypt some portion of the message. When the message is received, the receiver uses the sender's （） key tp decipher the digital signature to verify the sender's identity.横线处应选（ ）。


A. interpretation
B.signatures
C. encryption
D.decryption

答案：B
解析：
对称加密或私钥加密的基础是通信双方共享同一密钥。发送方使用一个密钥作为数学运算的一部分把明文加密成密文。接收方使用同一密钥把密文解密变成明文。在非对称或公钥加密方法中，每个用户使用两种不同的密钥:一个是只有这个用户知道的私钥;另一个是与其对应的任何人都知道的公钥。根据加密算法，私钥和公钥是数学上相关的。一个密钥用于加密，而另一个用于解密，依赖于实现的通信服务的特点而用法有所不同。此外，公钥加密技术也可以用于报文的数字签名。数字签名时使用发送方的私钥来加密一部分报文。当接收方收到报文时，就用发送方的公钥来解密数字签名，以便对发送方的标识进行验证。

第8题：

Which two statements are true about encrypting RMAN backup?() (Choose two.)

A. The transparent encryption of backups uses the encryption wallet

B. The database uses the same encryption key for every encrypted backup

C. The password encryption of backups only uses the password while creating and restoring backup

D. If transparent encryption is configured, you cannot use the SET ENCRYPTION BY PASSWORD command to make password-protected backups.


参考答案：A, C

第9题：

What is the objective of Diffie-Hellman？（）

  • A、used to verify the identity of the peer
  • B、used between the initiator and the responder to establish a basic security policy
  • C、used to establish a symmetric shared key via a public key exchange process
  • D、used for asymmetric public key encryption

正确答案:C

第10题：

Which description about asymmetric encryption algorithms is correct？（）

  • A、They use the same key for encryption and decryption of data.
  • B、They use different keys for decryption but the same key for encryption of data.
  • C、They use different keys for encryption and decryption of data.
  • D、They use the same key for decryption but different keys for encryption of data.

正确答案:C

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